diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index 40e0b56a5..ea8e0c96a 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -1168,32 +1168,32 @@ ec_x25519_prv.der:
 	$(OPENSSL) genpkey -algorithm X25519 -out $@ -outform DER
 all_final += ec_x25519_prv.der
 
-ec_x25519_pub.der: ec_x25519_pub.der
-	$(OPENSSL) pkey -in $< -inform DER -out $@ -outform DER
+ec_x25519_pub.der: ec_x25519_prv.der
+	$(OPENSSL) pkey -in $< -inform DER -out $@ -outform DER -pubout
 all_final += ec_x25519_pub.der
 
-ec_x25519_prv.pem: ec_x25519_prv.pem
+ec_x25519_prv.pem: ec_x25519_prv.der
 	$(OPENSSL) pkey -in $< -inform DER -out $@
 all_final += ec_x25519_prv.pem
 
-ec_x25519_pub.pem: ec_x25519_pub.pem
-	$(OPENSSL) pkey -in $< -inform DER -out $@
+ec_x25519_pub.pem: ec_x25519_prv.der
+	$(OPENSSL) pkey -in $< -inform DER -out $@ -pubout
 all_final += ec_x25519_pub.pem
 
 ec_x448_prv.der:
 	$(OPENSSL) genpkey -algorithm X448 -out $@ -outform DER
 all_final += ec_x448_prv.der
 
-ec_x448_pub.der: ec_x448_pub.der
-	$(OPENSSL) pkey -in $< -inform DER -out $@ -outform DER
+ec_x448_pub.der: ec_x448_prv.der
+	$(OPENSSL) pkey -in $< -inform DER -out $@ -outform DER -pubout
 all_final += ec_x448_pub.der
 
-ec_x448_prv.pem: ec_x448_prv.pem
+ec_x448_prv.pem: ec_x448_prv.der
 	$(OPENSSL) pkey -in $< -inform DER -out $@
 all_final += ec_x448_prv.pem
 
-ec_x448_pub.pem: ec_x448_pub.pem
-	$(OPENSSL) pkey -in $< -inform DER -out $@
+ec_x448_pub.pem: ec_x448_prv.der
+	$(OPENSSL) pkey -in $< -inform DER -out $@ -pubout
 all_final += ec_x448_pub.pem
 
 ################################################################